<template>
<!-- 电商后台主页 -->
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 折叠展开按钮 -->
        <div class="toggle-button" @click="toggleCollapse">|||</div>
          <!-- 侧边栏菜单区域 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"
          :default-active="activePath"
        >
        <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''"  v-for="item in menulist" :key="item.id"> <!-- 数值+ ‘’ 变成一个字符串-->
              <!-- 一级菜单模板区域 -->
            <template slot="title">
                <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
            </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体区 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>
<script>
export default {
  data() {
    return {
       //  左侧菜单数据
    menulist: [],
    iconsObj: {
      // 创建对象 通过菜单id  动态绑定字体图标 
      '125': 'iconfont icon-user',
      '103': 'iconfont icon-tijikongjian',
      '101': 'iconfont icon-shangpin',
      '102': 'iconfont icon-danju',
      '145': 'iconfont icon-baobiao',
    },
    // 是否折叠
    isCollapse: false,
    // 被激活的链接地址
    activePath: ''
    }
  },
  //生命周期函数
  created() {
     this.getMenuList()
     this.activePath = window.sessionStorage.getItem('activePath')//激活状态赋值给data  进行保存
  },
  methods: {
    logout() {
      //清空token
      window.sessionStorage.clear()
      // 跳转到登录页
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList() {
      const {data: res} = await this.$http.get('menus')
      if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data  //成功后赋值左侧菜单数据
      console.log(res);
    },
    // 点击按钮  实现切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态  实现二级菜单按钮颜色变化
    saveNavState(activePath) {
       window.sessionStorage.setItem('activePath',activePath)
       this.activePath = activePath
    }
  },
}
</script>
<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between; //左右贴边对其
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      padding-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  margin-right: 10px;
}
.toggle-button{
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>>

